One of my in-game friends pointed this little nugget out, as I was griping about no Turbine points as part of the pre-orders , when you pre-order there is an option to add a TP bundle for 40% off. Not quite the double point bonus sale, but still kinda nice:
Base Edition – 1,550 TPs for $11.70
Heroic Edition – 2,500 TPs for $17.39
Legendary Edition – 5,000 TPs for $29.99
Notice the amount of points is tied to the specific edition you purchase. Something else to consider as you weigh your options of the pre-order.